Procedures

1

Adjust oven rack to middle position and preheat oven to 200°F. Spray a 12-cup muffin tin with baking spray, then line tin with cupcake liners and once again lightly spray tin with baking spray, making sure to coat surface of tin.

2

Beat whites, vinegar, and salt on medium-low speed until loosened, about 30 seconds. Increase speed to medium-high and beat until soft peaks form, 2 to 3 minutes. Combine sugar and cornstarch and, with mixer running, add to bowl 1 tablespoon at a time.

3

Once all the sugar mixture has been added, continue mixing until stiff, glossy peaks form, about 2 minutes longer. Add vanilla and beat just until combined.

4

Transfer mixture to a pastry bag or large zipper-lock bag fitted with a 1/2-inch star or plain pastry tip. Pipe meringue in a circular motion, pressing tip into meringue as it pipes out, into prepared tin, mounding meringue about 1-inch above edge.